Hydrogen psychosis is a fictional ailment acquired by SCUBA divers in the Wes Anderson-directed movie The Life Aquatic with Steve Zissou. It is apparently based on the very real health risk nitrogen narcosis, caused by the effects of relatively fast, relatively great changes in external pressure on the human body.

A fictional type of psychosis probably based on nitrogen and hydrogen narcosis.

Symptoms of hydrogen psychosis are red eyes (hence the alternative name), confusion, disorientation, increase in heart rate, thought disorder, however it is not defined by a loss of contact with reality.

It is thought that the condition is not permanent and will pass much like the above mentioned narcosises.